WiFi and baseband

In our iPad 2 preview I speculated that Apple might have moved entirely to Qualcomm for the iPad 2 baseband, and the most likely guess was to the same Qualcomm MDM6x00 used in the Verizon iPhone. Turns out that I was only partially right. Looking at the difference in weight between the Verizon and AT&T models on the Apple website should've been the dead giveaway, but I initially suspected the reason was more area dedicated to power amps for the GSM/UMTS version. 


Black RF window at the top, even on a white iPad.

The Verizon iPad 2 shares the same Qualcomm MDM6600 baseband as the Verizon iPhone 4. The AT&T (GSM/UMTS) iPad 2 on the other hand uses the same Infineon, ...errr Intel X-Gold 618 baseband as the GSM/UMTS iPhone 4. It's interesting to see Apple using two different basebands when one could have covered both CDMA2000/EVDO and GSM/UMTS, and faster HSPA at that rate. The X-Gold 618 just isn't super impressive anymore in a world dominated by HSDPA 14.4 and 21.1 compatible basebands. That said, it's a welcome improvement from the X-Gold 608 shared between the iPhone 3G, 3GS and GSM/UMTS iPad, which lacked HSUPA entirely, and thus had a maximum upstream rate of 384 kbps (UMTS speeds). 

GSM/UMTS (AT&T) iPad 2 - Network Support
GSM/EDGE Support 850 / 900 / 1800 / 1900 MHz
UMTS/HSDPA/HSUPA Support 850 / 900 / 1900 / 2100 MHz
HSDPA/HSUPA Speeds 7.2 Mbps / 5.76 Mbps
Baseband Hardware Infineon/Intel X-GOLD 618

CDMA (Verizon) iPad 2 - Network Support
CDMA2000-1xEV-DO 800 / 1900 MHz
Theoretical Downstream/Upstream 3.1 Mbps / 1.8 Mbps
Baseband Hardware Qualcomm MDM6600

The cellular enabled versions of the iPad 2 still are easily picked out by the black plastic strip at the top which is an RF window. Curiously, the color of the RF window is black even on the white iPad models, which seems a bit un-Apple. Maybe black made more sense since white plastic might eventually show some discoloration. Through testing the window seems to also be used for WiFi in addition to cellular. The GSM/UMTS version has a microSIM slot and comes with a SIM ejector tool in the package.

 

I found the microSIM incredibly difficult to eject on my AT&T iPad 2 compared to every other iDevice. You have to insert the ejector tool normal to the curved surface, which ends up being at an angle of nearly 45 degrees with respect to the back surface. It isn't how I expected things to work, and the tray itself is a bit awkward. 

I carried around the AT&T version of the iPad 2 and ran over 150 speedtests using Ookla's speedtest.net application. I averaged throughput of 2.76 Mbps down and 802 kbps up, with latency of 390 ms. Anand carried around the Verizon version and saw downstream speeds averaging 872 kbps down, 434 kbps up, and latency of 382 ms. 

3G Speed Comparison - Speedtest.net to best host
Provider / Data Verizon - (EVDO) AT&T - (UMTS/HSPA)
Max Downstream 1.679 Mbps 6.135 Mbps
Average Downstream 0.872 Mbps 2.759 Mbps
Max Upstream 0.837 Mbps 1.635 Mbps
Average Upstream 0.434 Mbps 0.802 Mbps
Average Latency 382 ms 390 ms
Minimum Latency 298 ms 239 ms

Pricing between the two providers is interesting. It appears that Verizon was careful to not compete with AT&T at the same data package points, instead targeting data packages other than the two 256 MB and 2 GB bundles AT&T already offers. At the same time, pricing at 3 GB on Verizon is exactly where you'd wind up should you run over 2 GB on AT&T and incur the automatic $10.00 overage charge. Interestingly enough, whereas AT&T bills you automatically when you run over your data caps, Verizon simply stops and lets you add more data before the billing cycle ends. It's an interesting distinction, certainly competition is good. In addition, there doesn't appear to be any activation charge for either AT&T or Verizon. 

3G Enabled USAiPad 2 Data Plan Pricing
Provider Verizon (CDMA2000/EVDO) AT&T (GSM/UMTS)
250 MB NA $14.99 / mo - $14.99 for each additional 250 MB
1 GB $20.00 / mo NA
2 GB NA $25.00 / mo -$10 for each additional GB
3 GB $35.00 / mo NA
5 GB $50.00 / mo NA
10 GB $80.00 / mo NA

So which of the two is the one to get in the US? Ultimately the decision about which is "better" is really a function of local coverage profile, speeds, and how much data you use (which will determine your pricing). If you're an iPad 1 AT&T user and used unlimited, you also have the option of grandfathering it in for some time as well. Unless you’re in an overloaded metropolitan area, AT&T 3G data speeds are undeniably faster. At the same time, Verizon has more EVDO coverage that, while slower, is generally more consistent. Verizon’s pricing also includes heavier data numbers than AT&T does, so if you’re looking for something to completely replace a notebook with and intend to not use WiFi, that’s a fairly big draw. 

Speaking of data use, I find the fact that the “Post PC” era includes implicit data caps (neither Verizon nor AT&T offer any unlimited data iPad packages to new customers) somewhat disturbing. I burned through just shy of 1 GB of my 2 GB AT&T plan in 3 days of use. By the time I got finished writing everything on my review sections, I had already used more than half.

 

Words cannot express my frustration - nay, rage - at the telecom industry's calculated assault on unlimited data plans, first in the mobile space, and now alarmingly with terrestrial DSL. Glass caps on both have always existed (200 or 250 GB for cable, 5 GB for essentially all mobile), but unless you clearly were abusing it, nothing happened. This move to tiered billing is a much more alarming trend. The above screenshot coupled with my use patterns (I have under 37 MB per day for the rest of the month? HA!) is precisely why I can't possibly see myself using the iPad 2 on a day to day basis. I hate watching a meter, but at least I do it. The problem isn't so much the number so much as the psychological effect of knowing you're eventually going to run into the celing. 

WiFi

The iPad 2 uses the exact same 802.11a/b/g/n WiFi + Bluetooth 2.1 EDR stack as its predecessor - the BCM4329. Like the iPad 1, the iPad 2 has 65 Mbps (long guard interval, 20 MHz channel, 1 spatial stream) 802.11n support on both 2.4 GHz and 5 GHz. Essentially WiFi speeds and behavior close to the AP is exactly the same as it was before. I’ve seen other WiFi stacks on mobile devices with “802.11n” support provide short guard interval 20 MHz rates of 72 Mbps, but nothing above, yet, so it’s fair to say that the iPad 2 WiFi authentication rate is about par with the competition. That said, Bluetooth 3.0 is already here on a bunch of other devices. 

WiFi Performance

Unfortunately, WiFi range on the iPad 2 is noticeably less than its predecessor, and throughput slows down much earlier on the iPad 2 than it does on the iPad 1. I tested with a WiFi - 3G (AT&T) model and found that I’m able to make it further away from the AP by a good 10 meters or so, but throughput even after you drop one WiFi bar on the iPad 1 is continually better than on the iPad 2. 

WiFi throughput also tells a similar story, it just isn’t quite as good as its predecessor. It’s a bit unfortunate since Apple certainly could’ve used this refresh opportunity to be the first to introduce a two spatial stream 802.11n device.

For now, the wrap up with regards to the iPad 2’s WiFi performance is that close to the AP, things are just like they used to be. At the edge of WiFi coverage, the iPad 1 edges out the iPad 2 at maintaining higher negotiated throughput and actual speeds. 

 

Apple's foray into iPad cases - Smart Covers Display Analysis
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  • name99 - Sunday, March 20, 2011 - link

    "you cant be a very tech inclined person if if you think you are, if you dont know that 1.2 GHz quad core arm cortex is coming later this year and so most tech people are waiting on that to happen"

    Really? You're going to buy that crappy 1.2GHz quad core A9? You're not going to wait the even better 1.8GHz quad core A15 that will be available in late 2012? Sucker!

    Personally I think that if you buy now, before the 802.11s wireless spec is standardized, and before the chipsets support OpenGL 6, you're just throwing your money away. But I tell you, come 2020, that's going to be one SWEET rig that I finally get round to buying.
  • CZroe - Sunday, March 20, 2011 - link

    "Just to test it out, I shot a series of videos of my car and stitched them together using iMovie, then added some titles and a soundtrack."

    I found iMovie completely useless on my iPhone 4 and iPhone 3GS because I could not combine two clips/videos nor could I make a runing commentary with titles.

    Are you sure that the iPad 2 version can do this or were all the "videos" in the "series" made from the same longer video?
  • CZroe - Sunday, March 20, 2011 - link

    "Lately Apple has been trying its hand at first party case solutions. It stated with the bumper on the iPhone 4, carried over to the original iPad, and continues now with the iPad 2."
    When you fix that typo ("stated" instead of "started"), you may also want to correct that fact about what came first.

    The iPad launched before the iPhone 4 so the official iPad case launched before the iPhone 4 bumper case, unless I somehow missed it and the official iPad case came out mid-life for the iPad.
  • darwiniandude - Sunday, March 20, 2011 - link

    pja: The 64gb 3G version was at most $1049 AUD rrp, before the price drop, the 64gb WiFi one was $899 AUD rrp. The 64gb WiFi was never $1100 AUD unless you were looking at eBay pricing while stock was scarce. Anyway as this article states, the iPad, provided it does what you require, is a great combination of battery life, weight and size. Tablets certainly aren't for everyone though.

    Deepcover96: Agreed. Hopefully this changes later and I'm sure it will, but for the moment Android has a poor selection of AAA titles. Nothing like Garageband or iMovie, but certainly nothing like Infinity Blade, Nanostudio, Beatmaker 2, World of Goo etc. I'm sure Gameloft and EA will eventually do more, provided they can monitize ok on Android. And for the limitations of iOS apps, I wouldn't be able to have an iPad as my only portable device if it were not for Pages/Keynote/Numbers/TouchDraw/Photogene and so on.

    CZroe: iMovie for iPhone (last year even) could do what you ask after the first update. This year it's greatly improved. A downside to this app and other Apple apps can be a lack of well known gestures. People don't know in Pages that if you hold your finger on an object, swiping with another finger moves it by one pixel, swipe with two moves it by 5 pixels, and so on. Likewise in iMovie, you swipe down through footage like you were cutting it at the playhead to make a cut. Each cut is a faultless transition, but then you can title each cut area separately. So you cut where you want the text to change, and label accordingly. In the new iMovie (only used on iPhone 4 as I sold 1st gen iPad whilst waiting for iPad2) when you import video there are standard iOS movie trim handles over the clip, you only need import the bits you want from each clip. But you could definitely always import more videos into one project in the last version. I think Apple need a modal help "Would you like to watch a short video about iMovie?" dialog or something on the first few launches with a website link, all these apps have their features tucked away so people often think they're less powerful than they are. I'm not sure Apple is choosing the best ratio of controls to expose to the user here. And yes, iPad case came out before iPhone 4, definitely.
  • kschaffner - Sunday, March 20, 2011 - link

    An awesome free web browser for the iPad is Terra, it gives you tabs, has an incognito mode. etc I would definitely check it out.
  • darwiniandude - Monday, March 21, 2011 - link

    Thanks, I'll check it out. I only use iCab as I bought it for iPhone, it got a universal update and I've been happy enough not to bother looking elsewhere. (it does have a 'privacy' mode) also caching of pages for when you're offline. Anyway, I've downloaded Terra and will play with it on the new iPad. It looks nice.
    Ha, there's a Terra Incognito HD game, lol
  • medi01 - Monday, March 21, 2011 - link

    Looking at the rounded back of ipads, ipad2 in particular, it's hard to understand, why the newer version is easier to hold.

    With rounded surface, they both should be harder to hold, and ip2 in particular.
  • darwiniandude - Monday, March 21, 2011 - link

    The original had flat sides, probably about 4 or 5mm, and a giant convex back, domed in the centre. The new one is thinner, has no flat sides (the curve just falls away from the front) but it's more of a bevelled edge, and once you're about 1cm in from the edges the back is perfectly flat.

    Is it easier to hold? Dunno, haven't got mine yet :) But that's what people are saying.
  • thebeastie - Monday, March 21, 2011 - link

    Everyday I use my Ipad even when I don't think about it.
    I use it as my wake up Radio clock via TuneIn Radio app. This app is great as I can go to sleep with the timer and then wake up to Internet radio which beats the hell out of analog radio. I been looking at a digital radio for a while but there is no reason now for me in the world to do that, and digital radios aren't cheap, it is just another device the Ipad as replaced perfectly with much better screen interface, and life time of free updates as app software evolves.

    I think the Anandtech authors here saying that they found them selfs not using their original Ipad1 after a while didn't adapt their imaginations enough of where it can be used, maybe it is something to do with age and being hardwired into their life styles, dare I say it but becoming 'old school'.
    I am wondering how they wake up in the morning, I find it hard to believe there is a better way to wake up in the morning then from an Ipad radio app, if it is about sound quality there are plenty of speaker options.

    For people who don't get it then I say you just don't see things the same way, I would rather shove a pine cone up my backside then wait more then 2 seconds to be able to look at my email. A laptop takes ages to boot up let a lone the loading of the email client.

    The main reason I got an Ipad was because I LOVE to read the paper outside, but the wind blowing the paper around drives me nuts, the Ipad is a killer in this regard.
  • damianrobertjones - Monday, March 21, 2011 - link

    I have an Asus EP121, 4Gb ram, SSD drive, etc. It takes 20 seconds to start from cold onto the desktop. Anotgher 2 seconds to pen my email application.

    Is that fast enough?

    from sleep, we're talking seconds

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